421420440 has 64 divisors (see below), whose sum is σ = 1444872960. Its totient is φ = 96324480.

The previous prime is 421420423. The next prime is 421420451. The reversal of 421420440 is 44024124.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250006 + ... + 251685.

It is an arithmetic number, because the mean of its divisors is an integer number (22576140).

Almost surely, 2^421420440 is an apocalyptic number.

421420440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421420440 is an abundant number, since it is smaller than the sum of its proper divisors (1023452520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421420440 is a wasteful number, since it uses less digits than its factorization.

421420440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501712 (or 501708 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 421420440 is about 20528.5274678921. The cubic root of 421420440 is about 749.7305343070.

Adding to 421420440 its reverse (44024124), we get a palindrome (465444564).

The spelling of 421420440 in words is "four hundred twenty-one million, four hundred twenty thousand, four hundred forty".